Beijing’s latest restrictions on US rare earth companies, imposed in response to the Pentagon’s designation of leading Chinese firms, are testing the durability of the fragile US-China truce, analysts said. China’s export controls, targeting 10 US entities including national giants MP Materials and USA Rare Earth, mark one of the most significant escalations since Washington and Beijing reached a temporary truce last October in Busan – an understanding that was reaffirmed during the recent...